• Fix missing in.resetMark() to prevent unexpected growing of internal buffers when parsing ADT cases with field discriminators and custom codecs which redefine default nullValue implementation from java.io.InputStream and java.nio.DirectByteBuffer
• More efficient writing of doubles and floats with the xjb algorithm (faster up to 25% on JVM and up to 45% on JS platforms)
• Update Scala 2.12 to 2.12.21

All changes https://github.com/plokhotnyuk/jsoniter-scala/compare/v2.38.5...v2.38.6